Comment 11 for bug 245383

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opslynx (ioan-ionita) wrote :

I have an Intel 945GM and am using dual screens in extended mode. I'm experiencing the screen flicker as well.
I've tracked down the issue to a problem with Xorg. For some reason, it does DDC detection every time a new application is open (so every time a new app connects to the X server).The following lines are printed in the /var/log/Xorg.0.log EVERY TIME an application is launched:

imi@orcl:~$ tail /var/log/Xorg.0.log -n 30
(II) intel(0): EDID vendor "SEC", prod id 17495
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0 95.44 1440 1504 1536 1744 900 903 906 912 -hsync -vsync (54.7 kHz)
(II) intel(0): EDID vendor "SEC", prod id 17495
(II) intel(0): EDID vendor "SAM", prod id 549
(II) intel(0): EDID vendor "SEC", prod id 17495
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0 95.44 1440 1504 1536 1744 900 903 906 912 -hsync -vsync (54.7 kHz)
(II) intel(0): EDID vendor "SEC", prod id 17495
(II) intel(0): EDID vendor "SAM", prod id 549
(II) intel(0): EDID vendor "SEC", prod id 17495
(II) intel(0): Printing DDC gathered Modelines:
(II) intel(0): Modeline "1440x900"x0.0 95.44 1440 1504 1536 1744 900 903 906 912 -hsync -vsync (54.7 kHz)

This is clearly what is causing the screen flicker. We need to file a bug upstream against Xorg. Maybe one has been filed already. Anyone aware of this?

This bug should probably be moved to a more generic xorg package since it's not specific to nv. Maybe xserver-xorg-core ?

In the meantime, I've attached my /var/log/Xorg.0.log
Could others attach it as well to see if it is indeed the same issue? Thank you!